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Commitments and Contingencies - Repurchase Reserve Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Commitment And Contingencies [Line Items]
Beginning balance	$ 89,553	$ 49,694	$ 49,694
Provision released from operating expense, net	900	(322)
Charge-offs	(325)	(634)
Ending balance	90,343	48,810	89,553
Mortgage Loans [Member]
Commitment And Contingencies [Line Items]
Beginning balance	1,725	2,102	2,102
Provision released from operating expense, net	(34)	(88)
Charge-offs	(46)	(45)
Ending balance	$ 1,645	$ 1,969	$ 1,725

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